servo: Merge #6247 - Trace the prototype array on the global object (from jdm:tracefix); r=Ms2ger

This should allow the jQuery testsuite to complete.

Source-Repo: https://github.com/servo/servo
Source-Revision: 9edc296c46b05606c74920a42ba0effb5c953db0

servo/components/script/dom/bindings/codegen/CodegenRust.py

@@ -4166,9 +4166,13 @@ class CGClassTraceHook(CGAbstractClassHook):
         args = [Argument('*mut JSTracer', 'trc'), Argument('*mut JSObject', 'obj')]
         CGAbstractClassHook.__init__(self, descriptor, TRACE_HOOK_NAME, 'void',
                                      args)
+        self.traceGlobal = descriptor.isGlobal()
 
     def generate_code(self):
-        return CGGeneric("(*this).trace(%s);" % self.args[0].name)
+        body = [CGGeneric("(*this).trace(%s);" % self.args[0].name)]
+        if self.traceGlobal:
+            body += [CGGeneric("trace_global(trc, obj);")]
+        return CGList(body, "\n")
 
 class CGClassConstructHook(CGAbstractExternMethod):
     """
@@ -4770,7 +4774,7 @@ class CGBindingRoot(CGThing):
             'dom::bindings::utils::{DOMJSClass, JSCLASS_DOM_GLOBAL}',
             'dom::bindings::utils::{find_enum_string_index, get_array_index_from_id}',
             'dom::bindings::utils::{get_property_on_prototype, get_proto_or_iface_array}',
-            'dom::bindings::utils::finalize_global',
+            'dom::bindings::utils::{finalize_global, trace_global}',
             'dom::bindings::utils::has_property_on_prototype',
             'dom::bindings::utils::is_platform_object',
             'dom::bindings::utils::{Reflectable}',

servo/components/script/dom/bindings/utils.rs

@@ -10,6 +10,7 @@ use dom::bindings::conversions::{native_from_reflector_jsmanaged, is_dom_class};
 use dom::bindings::error::{Error, ErrorResult, Fallible, throw_type_error};
 use dom::bindings::global::GlobalRef;
 use dom::bindings::js::{Temporary, Root, Rootable};
+use dom::bindings::trace::trace_object;
 use dom::browsercontext;
 use dom::window;
 use util::namespace;
@@ -26,7 +27,7 @@ use js::glue::{IsWrapper, RUST_JSID_IS_INT, RUST_JSID_TO_INT};
 use js::jsapi::{JS_AlreadyHasOwnProperty, JS_NewFunction};
 use js::jsapi::{JS_DefineProperties, JS_ForwardGetPropertyTo};
 use js::jsapi::{JS_GetClass, JS_LinkConstructorAndPrototype, JS_GetStringCharsAndLength};
-use js::jsapi::JSHandleObject;
+use js::jsapi::{JSHandleObject, JSTracer};
 use js::jsapi::JS_GetFunctionObject;
 use js::jsapi::{JS_HasPropertyById, JS_GetPrototype};
 use js::jsapi::{JS_GetProperty, JS_HasProperty, JS_SetProperty};
@@ -596,6 +597,16 @@ pub unsafe fn finalize_global(obj: *mut JSObject) {
         Box::from_raw(get_proto_or_iface_array(obj) as *mut ProtoOrIfaceArray);
 }
 
+/// Trace the resources held by reserved slots of a global object
+pub unsafe fn trace_global(tracer: *mut JSTracer, obj: *mut JSObject) {
+    let array = get_proto_or_iface_array(obj) as *mut ProtoOrIfaceArray;
+    for &proto in (*array).iter() {
+        if !proto.is_null() {
+            trace_object(tracer, "prototype", proto);
+        }
+    }
+}
+
 /// Callback to outerize windows when wrapping.
 pub unsafe extern fn wrap_for_same_compartment(cx: *mut JSContext, obj: *mut JSObject) -> *mut JSObject {
     JS_ObjectToOuterObject(cx, obj)